[Resolved]  Ecom Express — awb number notified as invalid.

I placed my order on 24th july and by the ordering site, i was supposed to recieve it by 10th august. I checked the status of my order and was told by ecom express that i'd receive the order by 13th august. Today again i checked for my order status and now ecom express notifies me that the awb number is invalid. I've been checking the order status using the same awb number since the last one week, how has it become invalid when i've not even received my order yet.